[TechAssist] Re: Panasonic CTV # CTK-2790S, Chassis# AEDP152 or GL7C Repeat IC801 failure
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 18 Sep 2002 10:17:56 -0600
Dale,
What is it using for a Regulator ?
If it is the STR58041, check the feed back line for an 180 ohm resistor.(I
think off pin # 4). I can look it up if you need me to.
I had one that checked at 18 ohms. This threw me a curve ball,..bacause the
color code had faded, and looked like an 18 ohm vaue was correct, when in
fact it should have been 180 ohms all the time.
HTH
LLW
LeRoy Westlund
Westlund TV & Electronics " It's such a pretty world
93 North Main today !....
Centerfield, UT 84622-0087 Look at the Sunshine. "
Ph./Fax 435-528-3822 :-)
mailto:LLW@xxxxxxxxxx
-----Original Message-----
From: HarrisTV50010@xxxxxxx <HarrisTV50010@xxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Tuesday, September 17, 2002 4:31 PM
Subject: [TechAssist] Panasonic CTV # CTK-2790S, Chassis# AEDP152 or GL7C
Repeat IC801 failure
>We have a Panasonic CTV Model# CTK-2790S Chassis# AEDP152 or GL7C. This
unit
>came in with the complaint of popped and went dead. We found C821, IC801 &
>D805 shorted. Q801 has a hole blown out of it and R826 was open.
>We replaced C821, IC801, D805, Q801, R826, C807 & R825. After replacing
these
>parts the set worked for a couple of minutes with all the proper voltages
>coming out of it. Then it suddenly went dead. We found IC801 had gone bad
>again. We replaced it, shorted the power relay and slowly brought up the AC
>going into the set. The B+ coming out of the secondary of the switching
>transformer T801 are normal. The IC starts to get hot. The waveform on the
>collector (pin 3 ) of IC 801 seems normal except the frequency seems to
>quiver too much and the base (pin 2) of IC801 is supposed to be 14v p-p but
>we only get about 4v p-p with the same frequency quivering as the
collector.
>We have checked every other part on the primary of the power supply and
>everything seems OK. Sorry for writing a novel about this unit. Does any
one
>have any notes on possible problems with this power supply?
>
>TIA,
>Dale
>
>
>Dale A. Lubow... HarrisTV50010@xxxxxxx ..515-232-1109..(Fax)515-232-3356
>Harris TV & Appliance..........335 Lincoln
>Way.....Ames.....Iowa.....50010-3384
>
>
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